In the resin sand casting process, 3-aminopropyltrimethoxysilane (CAS No.: 13822-56-5) is an efficient additive that can significantly enhance the adhesion between resin and silica sand and improve the strength and moisture resistance of molding sand. Its unique chemical structure makes it an indispensable functional additive in the casting industry to ensure the quality of castings and process stability.

1. Chemical structure and mechanism of action
The molecular structure of 3-aminopropyltrimethoxysilane contains two key functional groups:

Amino group (-NH2): chemically reacts with active groups in the resin (such as epoxy, hydroxyl, etc.) to form stable chemical bonds, enhancing the bonding between the resin and silica sand.

Methoxy group (-OCH3): hydrolyzes to form silanol (Si-OH), which forms siloxane bonds (Si-O-Si) with hydroxyl groups on the surface of silica sand, improving the interfacial bonding strength between the resin and silica sand.

2. Main functions in resin sand casting
Enhance bonding: Through chemical bonding, the bonding strength between resin and silica sand is significantly improved, and casting defects (such as sand holes, pores, etc.) are reduced.

Improve the strength of molding sand: Enhance the dry and wet strength of molding sand to ensure that the casting is not easy to break or deform during the pouring process.

Improve moisture resistance: The formation of siloxane bonds makes the molding sand hydrophobic, reduces the impact of environmental humidity on the performance of molding sand, and improves the surface quality of castings.

Optimize process stability: Reduce the amount of resin, reduce production costs, and improve the consistency and reliability of the casting process.

3. Application advantages
Improve the quality of castings: By enhancing the strength and moisture resistance of molding sand, reduce casting defects and improve the yield rate.

Reduce production costs: Reduce the amount of resin, optimize process parameters, and reduce raw material and energy consumption.

Environmental protection: The hydrolysis products are methanol and water, which are environmentally friendly and in line with the development trend of green casting.

4. Application fields
Cast iron and cast steel: Suitable for resin sand casting process of various cast iron and cast steel parts, improving the surface finish and dimensional accuracy of castings.

Nonferrous metal casting: In the casting of nonferrous metals such as aluminum alloy and magnesium alloy, it improves the fluidity and collapsibility of the molding sand and improves the quality of castings.

Complex casting production: Suitable for the production of castings with complex shapes and high precision requirements, ensuring the stability and consistency of the casting.

5. Usage recommendations
Additional amount: Usually the addition amount is 0.5%-2% of the resin weight, and the specific amount needs to be adjusted according to the process conditions and performance requirements.

Usage method: After mixing 3-aminopropyltrimethoxysilane with the resin evenly, add it to the silica sand for sand mixing.


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